Sounds like a good idea, just don't freeze your batteries durring a summer tornado thunder storm or huricane
Since I plan to have my bank under ground temps won't be much problem. I had been thinking on these though myself for extra cooling for a freezer or frig as a dump load.
Freezer will run normal on 120Ac all the time and when the dump load kicks in it just gets extra cold durring that time so it won't kick on as soon from the AC. Same for a frig as long as I don't freeze the milk and eggs durring a storm
Pipe the heat outside durring the summer. I figure this would be an extra unit near the batteries, not in the house, so wireing the DC would not be too bad. I often keep the freezer in an out building anyway, not in the house, then carry in a large box of frozen foods as needed to the house frig to fill it.
Currantly not using a freezer, who can afford food???
Actually I will be filling it again soon.